Am 09.07.2015 um 11:21 schrieb Gerard Meijssen:
Hoi, If that is the use case, not much changes. We are talking software. When a property is selected, the software does not need to show the property number and still store it. Nothing new here. It does not need to change the label either when Wikidata decides to change the label. A report may be produced to show the use of the old label... Again, nothing new here. It has been done and can be done again.
So, the label changes. Later, the page that uses it on Wikipedia is edited. The parser looks at the #property tag, and sees a label that it no longer understands (how would it). The data transclusion is broken. Wouldn't it be nice if the transclusion could keep working? Unique aliases would do that.
Alternatively, we could do what Ricordisamoa suggests, and just put the P-ID into the wikitext. But then you couldn't easily see what {{#property:P1234}} means when looking at the wikitext. If people are OK with that - fine!
Or we could just do away with wikitext completely. Then we wouldn't have this problem. We'd use the ID internally, and the label for display and editing, just like we do on Wikidata. But I don't think that's going to happen any time soon.
-- daniel